/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Runtime.Serialization;
using Spring.Expressions.Parser.antlr.collections;

namespace Spring.Expressions;

/// <summary>
/// Represents ternary expression node.
/// </summary>
/// <author>Aleksandar Seovic</author>
[Serializable]
public class TernaryNode : BaseNode
{
    private bool initialized = false;
    private BaseNode condition;
    private BaseNode trueExp;
    private BaseNode falseExp;

    /// <summary>
    /// Create a new instance
    /// </summary>
    public TernaryNode() : base()
    {
    }

    /// <summary>
    /// Create a new instance from SerializationInfo
    /// </summary>
    protected TernaryNode(SerializationInfo info, StreamingContext context)
        : base(info, context)
    {
    }

    /// <summary>
    /// Returns a value for the string literal node.
    /// </summary>
    /// <param name="context">Context to evaluate expressions against.</param>
    /// <param name="evalContext">Current expression evaluation context.</param>
    /// <returns>Node's value.</returns>
    protected override object Get(object context, EvaluationContext evalContext)
    {
        if (!initialized)
        {
            lock (this)
            {
                if (!initialized)
                {
                    AST node = this.getFirstChild();
                    condition = (BaseNode) node;
                    node = node.getNextSibling();
                    trueExp = (BaseNode) node;
                    node = node.getNextSibling();
                    falseExp = (BaseNode) node;

                    initialized = true;
                }
            }
        }

        if (Convert.ToBoolean(GetValue(condition, context, evalContext)))
        {
            return GetValue(trueExp, context, evalContext);
        }
        else
        {
            return GetValue(falseExp, context, evalContext);
        }
    }
}
